<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"
          xmlns:c="http://java.sun.com/jsp/jstl/core"
          version="2.0">

    <jsp:directive.page contentType="text/html" pageEncoding="UTF-8"/>

    <html>
        <head>
            <title> Error </title>
        </head>
        <body><h3>Error</h3>
            <hr/>
            <jsp:expression>(request.getAttribute("error") != null)
                    ? (String) request.getAttribute("error")
                    : "unknown error"</jsp:expression>               
                <hr/>
                <a href="Controller?command=returnToMain">Return</a>
            </body>
        </html>
</jsp:root>